Metal halide lamps have more lumens than mercury vapour. However, M59 lamps, like all quartz MH lamps, loose quite a bit of lumens over their lifetime. Mercury vapour lamps loose lumens as well, but having a longer life, the decrease is more gradual than metal halide.
Some medium and high wattage mercury vapour lamps have been known to last very long, and loose most of their lumens. Some give light equivalent to a 40W incandescent despite being 250 or 400 watts. When this happens, the lamp still consumes its rated power, making them quite inefficient.
The longest-lived MV lamps I have personally seen were a couple CD 175W KenRads; BT-28 with /W phosphor. They operated untouched in dusk-to-dawn Wheeler horizontal MV fixtures on a local municipal light department system from 1965 to 2016. They and these fixtures were removed that year in favor of LED. One of the lamps was not working at the time of removal and the other was. I missed out regarding the EOL one but I was fortunate to get the working one, complete with the fixture from the utility. Its arc tube is pretty black and the lamp illumination is about equivalent to a 100W incandescent or maybe a little better.
